Drilling-machine.



PATENTED JAN. 15, 1907.

G. & W. A. DAWSON.

DRILLING MACHINE. APPLICATION FILED JULY 12. 1906.

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THE NORRIS PETER; 50-, WASHINGTON, 0. c.

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GEORGE DAWSON AND l/VILLIAM ALFRED DAlVSON, OF KINGSTON-UPON- HULL, ENGLAND.

DRILLING-MACHINE.

Specification of Letters Patent.

Patented Jan. 15, 1907.

l riginal application filed February 24, 1 906, Serial No. 302,724. Divided and this application filed July 12,1906. Serial No. 325.958.

To (all whom, it may concern:

Be it known that we, GEORGE DAWSON and VILLIAM ALFRED DAWSON, engineers, residing at 3 Buller Grove, Edinburgh street, in the city and county of Kingston-upon- Hull, England, have invented certain new and useful Improvements in Drilling-Niachines; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object improve ments in means for holding true, supporting, protecting, and feeding the drills or the like tools of drilling, boring, and similar machines, our improvements being such that the drill or the like tool is held perfectly true when fitted in position, is prevented from falling out until purposely released, is protected by there being only a small part of it exposed to breaking strain, and is fed to the metal it is drilling or boring automatically, evenly, and with regularity, so that a deadtrue bore is obtained and a quick and a clean cut, the present application for Letters Patent being for those parts of the invention relating to drilling and boring machinery which were included in the specification and drawings which accompanied our applica tion for patent which was lodged on February 24, 1906, and serially numbered 302,724.

In the accompanying drawings, Figure 1 shows in side elevation, partly in section, part of a drilling-machine with our improvements applied. Fig 2 is an enlarged view, partly in section, of part of the head of the machine, of part of the feed-box, and of the driving-wheel mounted on such feed-box. Fig. 3 is an elevation of the pressure-disk, which travels up and down the interior of the feed-box and forces down the drill. Fig. 4 is a plan view ol same, and Fig. 5 is an enlarged sectional view of the bevel-wheel in which is the device For rotating the drill or similar tool and shows the device a-ndadrill in position.

In carrying our invention into effect we employ a feed-box in the form of an internally-threaded tube A, the top. end of which is preferably dome-shaped and is mounted loosely in a bore 1 in the top projecting arm or part 2 of the machine-frame 3, the bottom end being loosely mounted in a bore 4 in a second projecting arm or part 5 of the said machine-frame 3. A spur or other suitable wheel 6 is mounted on the feed-box or feedtube A by keying or any other suitable means, so that when such spur-wheel is rotated the feed-box rotates with it.

l/Vithin the feed-box or feed-tube A is what may be termed a pressure-disk B for carrying the drill or other tool and putting the pressure on said drill or tool. This pressure-disk B is externally threaded, so as to engage the thread on the inside of the teed-box, and has a central bore in it for the head of the drill to pass into, the top of such.

pressure-disk being preferably reduced size and being provided with pivoted springcontrolled levers or snaps B, the top ends of which project above the top of the reduced part of the pressure-disk, which is preferably of dome shape, the bottom ends of such spring-controlled levers or snaps being in the form of noses B which pass through slits or holes B in such top part and engage an annular groove 0 in the top end of the drill or the like 0, which is of the twist or helical groove type.

Fitting into or secured by any suitable means to the second projecting arm or part of the maohineframe 3 are two or more guides, uprights, or stanchions E, which project up into the teed-box or feed-tube A and through the pressure-disk B, which has slits or holes B running through it to receive such uprights, which by being fixtures to the second projecting arm or part 5 of the machineframe 3 prevents the rotation of the pressure-disk, which simply travels up and down on such uprights as a result of the rotation of the teed-box A.

Mounted on a longitudinal shaft 7 is a bevel-wheel 8, which gears with a bevelwheel 9, provided with bosses 10, which fit in recesses 11 in the projecting arm or part 5 of the machine-frame 3, such bevel-wheel 9 being bored to receive a die F for the drill C, such die having a central twist-bore F to correspond with the twist of the drill, such drill passing through the bore of the die, the die being so fitted in the bevel-wheel 9 as to turn with such bevel-wheelas, for instance, by being provided with a feather or feathers E to fit into grooves in the said bevel-wheel 9.

The bottom part 12 of the projecting arm 5 of the machine-frame is detachable from the said arm and is secured thereto by means of bolts 13 or other suitable means, and such detachable part is provided at its bottom end with a boss 14 to receive a threaded cap or box-nut 15, which keeps the die F in position.

The top projecting arm or part 2 of the machine-frame is bored through, and a brass or other suitable block 16 is fitted therein, this block having a cup-shaped recess in it into which the top of the feed-box A fits, a cap 17 being secured on the top of the projecting arm 2, such cap having a threaded hole in it to receive a set pin or screw 18, which holds down the block 16 and so prevents the feedbOX from working up, said set-screw 18 having a check-nut for the purpose of locking and adjusting the pressure of the block 16 on the crown or head of the feed-box.

Mounted on a spindle 19, carried in brackets 20, cast or otherwise formed on the prov jecting arms or parts 2 and 12 of the machine-frame 3, is a suitable toothed wheel 21, which gears with the toothed wheel 6,

, mounted on the feed-box A.

The spindle 19, which carries the toothed wheel 21, is provided with a hand-wheel 22, or the equivalent thereof, by means of which such toothed wheel 21 is rotated, and consequently the feed-box A also.

The mode of operation of the apparatus is as follows: By turning the hand-wheel 22 the toothed wheel 2]. is rotated, and such toothed wheel in turn rotates the toothed wheel 6, which consequently rotates the feedboX A. This causes the pressuradisk B to travel down the interior of the feed-box, said pressuredisk being prevented from turning owing to the uprights E, which pass through it, being fixtures on the projecting arm 5 ol the frame 3 of the machine. Consequently such uprights simply slide through the holes in the pressure-disk as such disk descends. During the time the pressure-disk is descend ing in the feed-box the drill C is being rotated by means of the. die F in the bevelwheel 9 as a result of such bevel-wheel being rotated by the bevel-wheel 8, mounted on the shaft 7, which is provided with a pulley or pulleys driven by a belt, strap, or the like from shafting or other driving source.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a drilling-machine, the combination, with a support, and an internally-screwthreaded feed-tube journaled in the said sup port; of a guide secured at one end. to the said support and projecting longitudinally within the said feed-tube, a non-revoluble pressure-disk for the tool engaging with the said feed-tube and slidable on the said guide, a die for engaging the tool, driving mechanism for revolving the said die, and separate driving devices for revolving the said feedtube and thereby moving the tool longitudinally within it.

2. In. a drilling-machine, the combination, with a support, and an internallyscrewthreaded feed-tube journaled in the said support; of an externally-screwthreaded pressure-disk for the tool engaging with the said feed-tubeand provided with a longitudinal guide-opening, a guide secured to the said support at one end and extending longitudinally within the said feedtube and engaging with the said guide-opening, a die for revolving the tool also revoluble in the said support, driving mechanism for revolving the said die, and separate driving devices for revolving the said feed-tube.

3. In a drilling-machine, the combination, with a tool-shank provided with a circumferential groove, of a pressure-disk for feeding the tool, means for sliding the said pressuredisk longitudinally, spring-actuated levers pivoted to the said pressure-disk and provided with jaws for engaging with the said groove, and driving devices for revolving the said tool independent of the said pressuredisk.

In testimony whereof we afliX our signatures in the presence of two witnesses.

GEORGE DAWVSON. WILLIAM ALFRED DAWSON.

WVitnesses:

Louis EDGAR KIPPAX, FRED. HAROLD RHODES. 

